In quantum computing the straightforward sequences of binary digits or "bits" that have served computing well for over half a century are abandoned. A working quantum computer uses a physical system that can be in either of two quantum states - representing "0" and "1" - known as quantum bits or "qubits". But quantum mechanics also allows these qubits to be placed in a superposition of the two states. In principle, therefore, a superposition of the states of a large collection of qubits can contain an enormous amount of information. (par 2) End of Citation: Science and Technology can be revolutionize by Quantum Computers Nov. 21, 2005